Porcelain Pony Share definition Flag A phrase used to describe a toilet, usually used by someone who is emphasizing its prolonged usage "After those tacos, I am going to be riding the old porcelain pony all night" Porcelain Pony by Old man withers September 3, 2005 0 0 Get merch Get the Porcelain Pony mug. Buy Now — $32.95 See more merch